Computer casing



FIG. 1 is a perspective view of a computer casing showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof showing a front cover opened withbroken lines being provided for reference only and forming no part ofthe claimed design.

The ornamental design for a computer casing, as shown and described.